Boring-tool.



Patented Apr. 27, 1915.

A. S. GOODWIN.

BORING TOOL.

APPLICATION FILED IUNE 8, I9I4.

THE MORRIS PETERS Ca., PHoTzrLlTHO.. WASHINGTON. D.

ALBERT S. GOODWIN, OF TACOMA, WASHINGTON.

BORING-TOOL.

Speccation of Letters Patent.

Patented Apr. 27, 1915.

Application filed June 8, 1914. Serial No. 843,878.

To all whom it may concern f l Be it known that I, ALBERT S. GOODWIN, a citizen of the United States of America, and a resident of the city of Tacoma, in the county of Pierce and State of lVashington, have invented certain new and useful Improvements in Boring-Tools, of which the following is a specification.

My invention relates particularly to a device of the above character in which a fluid is utilized for removing theshavings, and it has for its primary aims to produce such a device which will be efficient in operation, simple of management and operation, and one which embodies simplified structural features throughout whereby a durable tool is obtained.

These and other objects I attain by the construction shown in the accompanying drawings and specified in the following description while those features of construction, arrangements and combinations of parts on which protection is desired will be succinctly defined in the appended claims.

In the drawings: Figure 1 is an elevation of a machine embodying my invention, parts being in section for clearness of understanding. Fig. 2 is a longitudinal section of my boring tool, taken about on line 2 2 of Fig. 1. Fig. 3 is a transverse section taken on line 3-3 of Fig. 1, parts being broken away. Fig. 4 is a cross section of my improved bit taken on line 4-4 of Fig. 2,` and Fig. 5 is a view illustrating my device in operation.

Referring by similar characters of reference to corresponding parts throughout, 1 designates my improved bit or cutter comprising a tubular body 1 divided across one end, by partition web 2, into a pair of delivery openings 1. lVeb 2 iiares outwardly into a support 2 which projects diametrically outward from the body 1 and carries the blades 3 and 3 and a screw 3 interposed therebetween. Blade 3 is formed with a solid cutting edge while blade 3 which projects from the opposite side of the support 2, has its cutting edge broken for reducing or comminuting the shavings to facilitate thel removal thereof from the bored opening. The blades projecting beyond the body 1 provide a path surrounding the latter through which the shavings are removed. It may be noted that the inner portions of the blades partially ycover the openings 1 (see Fig. 4) and tend to direct the issuing iuid toward the' cutting edges.

The bit is secured to a hollow, externally threaded shank 4 which is fixed to the shaft of a fluid motor 5. Shank 4 is provided with an opening 6 establishing communication between the conduit of shank 4 and an annular chamber 7 formed in the extension 8 of motor casing 8, said chamber 7 being connected to the exhaust of the motor by piping 9. A stuffing box 10 is mounted on extension 8 about shank 4 to eliminate the escape of fluid thereat.

Motor casing 8 is provided with oppositely projecting guides 11 to slide on guide ribs 12 of the standards 13 of a supporting frame 14. Standards 13 are pointed for securing suitable purchase while boring, and are connected adjacent the pointed terminals b v a cross frame member 15 on which is rotatably mounted an internally threaded nut 16. This nut is held against rotation by yielding pawl 17 and receives shank 4 for automatically advancing the bit 1 when the shank is being rotated by motor 5. Nut 16 carries a bevel gear 18 which meshes with a drive gear 19 of shaft 20 whereupon rotating the latter the nut is revolved to return the shank for a succeeding drilling operation.

In operation, motor 5 is driven by iiuid delivered through nozzle 21, and consequently the shank 4 is rotated. This action advances the shank through stationary nut 16 for feeding the bit 1. The exhaust fluid enters shank 4 and escapes through bit openings 1 for forcing the shavings from the bored hole which is larger than shank 4 see Fig. 5). To retract or return the shank, a tool is applied to shaft 2O for rotating the nut 16, the pawl 17 yielding to permit of such rotation.

The foregoing detailed description has been given for clearness of understanding only, and though I have shown my invention employed in boring stumps no undue limitation is to be understood therefrom, but the appended claims are to be construed as broadly as is permissible in view of the prior art. I Having thus described my invention, what I claim as new, anddesire to secure by Letters .Patent of the United States of America, 1s:-

1. A boring tool comprising a cylindrical socket member or sleeve adapted for attachment to a stem, a bar integral with said socket member and extending diametric'ally across one end thereof, and centrally divided extensions from said diametrical bar havingl an increased diametrical extent and shaped at their outer ends to form incline cutting lips. 7

2. A boring tool comprising a cylindrical socket member or sleeve internally threaded for the attachment of a stem and having a bar extending centrally across one end and having .centrally divided axial extensions from said bar which are bent to form inclined cutting lips, said lips projecting diametrical'ly beyond the outer margin of said socket member. Y

3.L A boring tool having a diametrically positioned bar and tvvo integral extensions nating in cutting edges, the cutting edge of one of said extensions being divided or discontinuous, to thereby cut a plurality of distinct grooves and the other cutting edge Y being continuous, to thereby remove the ridges left by the iirst named cutting edge.

Signed at Seattle, Tashingtomthis 19th day of May 1914.

ALBERT S. GOODWIN.

Witnesses: Y

E'. ARLITA ADAMS, CLARA A. HARM.

Copies. of this patent may be obtained for vecents each, by addressing the "'Cmmissionerof Patents,l

Washington, D. C. 

